/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.queryengine.plan.relational.planner;

import org.apache.iotdb.db.queryengine.plan.relational.sql.ast.SortItem;

public class OrderingTranslator {
  private OrderingTranslator() {}

  public static SortOrder sortItemToSortOrder(SortItem sortItem) {
    if (sortItem.getOrdering() == SortItem.Ordering.ASCENDING) {
      if (sortItem.getNullOrdering() == SortItem.NullOrdering.FIRST) {
        return SortOrder.ASC_NULLS_FIRST;
      }
      return SortOrder.ASC_NULLS_LAST;
    }

    if (sortItem.getNullOrdering() == SortItem.NullOrdering.FIRST) {
      return SortOrder.DESC_NULLS_FIRST;
    }
    return SortOrder.DESC_NULLS_LAST;
  }
}
